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Rapid Particle Patterning in Surface Deposited Micro-Droplets of Low Ionic Content via Low-Voltage Electrochemistry and Electrokinetics.

Sidelman N, Cohen M, Kolbe A, Zalevsky Z, Herrman A, Richter S - Sci Rep (2015)

Bottom Line: However, the use of DC-induced electrokinetics in miniaturized devices is highly limited.We show that this is made possible in low ion content dispersions, which enable low-voltage electrokinetics and an anomalous bubble-free water electrolysis.This phenomenon can serve as a powerful tool in both microflow devices and digital microfluidics for rapid pre-concentration and particle patterning.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering Faculty of Engineering &University Center for Nano Science and Nanotechnology Tel Aviv University, Tel-Aviv, 69978, Israel.

ABSTRACT
Electrokinetic phenomena are a powerful tool used in various scientific and technological applications for the manipulation of aqueous solutions and the chemical entities within them. However, the use of DC-induced electrokinetics in miniaturized devices is highly limited. This is mainly due to unavoidable electrochemical reactions at the electrodes, which hinder successful manipulation. Here we present experimental evidence that on-chip DC manipulation of particles between closely positioned electrodes inside micro-droplets can be successfully achieved, and at low voltages. We show that such manipulation, which is considered practically impossible, can be used to rapidly concentrate and pattern particles in 2D shapes in inter-electrode locations. We show that this is made possible in low ion content dispersions, which enable low-voltage electrokinetics and an anomalous bubble-free water electrolysis. This phenomenon can serve as a powerful tool in both microflow devices and digital microfluidics for rapid pre-concentration and particle patterning.

No MeSH data available.


A scheme of the device (top) and an actual device with a 30 μl droplet deposited on it (bottom).
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Related In: Results  -  Collection

License
getmorefigures.php?uid=PMC4543935&req=5

f1: A scheme of the device (top) and an actual device with a 30 μl droplet deposited on it (bottom).

Mentions: The device used in the following described experiments consists of a pair of identical 150 nm-thick gold electrodes, defined via photolithography on a silicon substrate with a 1000 nm-thick insulating oxide layer. The device’s area of interest is a junction, 100 μm wide at its narrowest region, defined by the electrode pair (see Fig. 1).


Rapid Particle Patterning in Surface Deposited Micro-Droplets of Low Ionic Content via Low-Voltage Electrochemistry and Electrokinetics.

Sidelman N, Cohen M, Kolbe A, Zalevsky Z, Herrman A, Richter S - Sci Rep (2015)

A scheme of the device (top) and an actual device with a 30 μl droplet deposited on it (bottom).
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4543935&req=5

f1: A scheme of the device (top) and an actual device with a 30 μl droplet deposited on it (bottom).
Mentions: The device used in the following described experiments consists of a pair of identical 150 nm-thick gold electrodes, defined via photolithography on a silicon substrate with a 1000 nm-thick insulating oxide layer. The device’s area of interest is a junction, 100 μm wide at its narrowest region, defined by the electrode pair (see Fig. 1).

Bottom Line: However, the use of DC-induced electrokinetics in miniaturized devices is highly limited.We show that this is made possible in low ion content dispersions, which enable low-voltage electrokinetics and an anomalous bubble-free water electrolysis.This phenomenon can serve as a powerful tool in both microflow devices and digital microfluidics for rapid pre-concentration and particle patterning.

View Article: PubMed Central - PubMed

Affiliation: Department of Materials Science and Engineering Faculty of Engineering &University Center for Nano Science and Nanotechnology Tel Aviv University, Tel-Aviv, 69978, Israel.

ABSTRACT
Electrokinetic phenomena are a powerful tool used in various scientific and technological applications for the manipulation of aqueous solutions and the chemical entities within them. However, the use of DC-induced electrokinetics in miniaturized devices is highly limited. This is mainly due to unavoidable electrochemical reactions at the electrodes, which hinder successful manipulation. Here we present experimental evidence that on-chip DC manipulation of particles between closely positioned electrodes inside micro-droplets can be successfully achieved, and at low voltages. We show that such manipulation, which is considered practically impossible, can be used to rapidly concentrate and pattern particles in 2D shapes in inter-electrode locations. We show that this is made possible in low ion content dispersions, which enable low-voltage electrokinetics and an anomalous bubble-free water electrolysis. This phenomenon can serve as a powerful tool in both microflow devices and digital microfluidics for rapid pre-concentration and particle patterning.

No MeSH data available.